Non-Return (Check) Valves
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For HVAC systems, sanitary applications and industrial technology >

Gravity circulation check SBO 21 DN 1, 1 > 1 / > 4 ӓ, PN 6 > W Valve inlet with collar for fitting a union nut > W Valve outlet with male thread > Gravity circulation check SBO 31 DN > Gravity circulation check SBO 11 DN 1, 1 > 3 / > 4 ӓ, 1, 1 > 1 / > 4 ӓ, PN 6 > W Valve inlet with female thread for direct connection to circulating pump > 1 / > 4 , PN 6 > W Valve inlet with collar for fitting a union nut > W Valve outlet with female thread > W Valve outlet with male thread Pump running, normal operationPump stationary, SBO preventing gravity circulation Forced opening of the valve with...

Guiding The guide resists wear and is corrosion-resistant. Jamming and canting of the valve cone are excluded Connections > W WW GESTRA gravity circulation checks are available with connections meeting all installation requirements. Available designs with either male or female thread for PN 6, 12" BSP Spring opening pressure Manual opening device All GESTRA gravity circulation checks are fitted with a manual opening device providing gravity circulation in the event of pump failure. > W The spring forces are adapted to the special use of the valve as gravity circulation checks and positively...

Today GESTRA can look back with pride on one hundred years of experience in valve manu- facture. The company offers a broad range of DISCO non-return valve must be designed for operation in oxygen, for example. It is even possible to manufacture the DISCO > ή valve, which has proven its worth a million times over, in a special material to answer specific needs. All GESTRA non-return valves are of the wafer type and have extremely short overall lengths. Thanks to their excellent design and hydrodynamic features, these valves offer clear advantages over conventional types: > non-return valves...

GESTRA DISCO > ή non-return valve in the fully open state GESTRA DISCO > non-return valve in the closed state > GESTRA DISCO > non-return valve with spiral centering, DN 15Ζ100 ( > non-return valve with self-centering body, DN 15Ζ100 ( > 1 / > 2 4֓)GESTRA DISCO > 1 / > 2 4֓) >

Hot-pressed brass / valve disc of plastic Heating installations up to 100C, compressed-air systemsHot-pressed brass / valve disc of austenitic steel For flanges PN 6 / 10 / 16 Heating installations, higher temperaturesSpecial brass / valve disc of austenitic steel W > For flanges PN 6 / 10 / 16 Liquids, gases, vapours / for industrial and heating plantsCast brass / valve disc of austenitic steel Please order these sizes as RK 41 Please order these sizes as RK 86A Grey cast iron / plastic PN 6 / 10 / 16 W > Liquids, gases, vapoursCast bronze PN 6 / 10 / 16 Seawater and drinking waterChromium...

with spiral centering PN 6 to PN 16, body material bronze, valve disc of austenitic steel RK 70 with spiral centering PN 6, body material hot-pressed brass, valve disc of PPO RK 44S with spiral centering PN 6 to PN 16. Body material: bronze. Valve disc: bronze RK 71 with spiral centering PN 6 to PN 16, body material hot-pressed brass, valve disc of austenitic steel RK 41 with spiral centering PN 6 to PN 16, body material special brass, valve disc of austenitic steel MB 14 Screwed 1/22" BSP, body material hot- pressed brass, valve disc of austenitic steel >

Tightness The degree of tightness lies well within the tolerances permitted in DIN EN 12266-1 Valve disc Spring cap > W W W Body The special shape always guarantees a centralized positioning of the spring. Material: austenitic steel Austenitic steel, metal-to-metal seat. RK 41 and RK 44 can alternatively be provided with a soft seat Guiding > W Springs > W W Four guide ribs are used to ensure low-wear operation. From DN 125 (5"), the valve cone is guided by a spindle/ sleeve arrangement Using different springs for the RK 41 and RK 44 permits variation of the opening pressure to meet the...

RK 76 The standard valve com- pletely of stainless steel at the price level of carbon steel > RK 29A with self-centering body, PN 63 to 160 (PN 400 on request), Class 400 to 1500 (Class 2500 on request). Material: austenitic steel > W with self-centering body, PN 10 to 40, DN 15 to 100 (1/2 to 4"). Facings suit- able for counterflanges to ASME 150 RF, ASME 300 RF, tongue flanges to DIN 2512 or male flanges to DIN 2513. Material: austenitic steel RK 49 with spiral centering, for high temperatures, PN 63 / 100 / 160, DN 15 to 200 (1/2 to 4"). Material: high-temperature austen- itic cast steel...

Valve disc Tightness Thanks to special machining, the degree of tightness lies well within the tolerances permitted in DIN EN 12266-1 Antistatic connection Spring cap > W W W The speacial shape always guarantees a centralized positioning of the spring. Material: austenitic steel Austenitic steel, metal-to-metal or soft seat Guiding > W Springs > W Four guide ribs are used to ensure low-wear operation. From DN 125 (5"), the valve cone is guided by a spindle/ sleeve arrangement Different springs permit varia- tion of the opening pressure to meet the operating require- ments. Material:...

Our experience gives you the quality, our visions give you the innovative energy. On this founda-tion, GESTRA has developed a non-return valve for industrial applications that combines many requirements in a single valve Ζ and therefore not only fulfils but also far surpasses your wishes and expectations. > Whether for DIN/EN, ASME or BS flange, this new DISCO > non-return valve is prepared for all inter-national standards. > two guide ribs, the rate of wear is halved Ζ making for long service life. What is more, jamming and canting of the valve disc is then hardly possible. The risk of...

1. Low wear through assured contact on two ribs 2. Cost savings through the long extension of service life 3. Better guidance of the valve disc through the four guide ribs integrated into the body 4. Optimum tightness through the new wide contact surfaces 5. More reliability through standard threaded antistatic connection 6. Easy installation through the simple body centering 7. Lower inventory costs through the more versatile range of applications 8. For all standards meets DIN/EN, ASME and BS standards www.gestra.de 15 >